Gas Turbine Fan Blade Electrostatic Dissipative Coating
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Solution Overview
Problem
Gas turbine engine airfoils experience electrostatic charge buildup due to friction with non-conductive particles, leading to potential sparks, radio interference, and operational inefficiencies, posing safety and material damage risks.
Innovation Solution
A fan blade design featuring an electrostatic dissipative coating, a conductive sheath, and a conductive ground tab with a flow path that directs electrostatic charge safely to the rotor, preventing spark discharge and ensuring charge dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If airfoils are operated in environments with impurity particles (snow, dust, sand, volcanic ash), then thrust generation is achieved, but electrostatic charge builds up on the airfoils due to friction with particles
Solution Approach 1:
A conductive coating is applied to the airfoil surface to act as an intermediary layer between the frictional contact with particles and the airfoil substrate. This coating layer conducts the generated electrostatic charge away from the airfoil surface through a conductive path, preventing charge accumulation while maintaining the airfoil's thrust-generating function.
Solution Approach 2:
The electrical conductivity parameter of the airfoil surface is changed by applying a conductive coating. This transforms the surface from a non-conductive state (prone to charge buildup) to a conductive state (able to dissipate charge), thereby resolving the electrostatic charge buildup issue while preserving aerodynamic performance.
2Reliability
If electrostatic charge is not dissipated, then charge accumulates on airfoils, but sparks can occur causing injury to ground workers and damage to components
Solution Approach 1:
A conductive path consisting of a conductive coating on the airfoil surface and a conductive element (such as a wire or trace) serves as an intermediary channel to safely transport electrostatic charge away from the airfoil. This controlled conduction path prevents uncontrolled spark discharge that could injure workers or damage components.
Solution Approach 2:
The conductive coating and grounding system work to maintain the airfoil at a safe electrical potential by continuously conducting away accumulated charge. This prevents potential differences from building up to levels that would cause dangerous spark discharges.
3Reliability
If electrostatic charge builds up on airfoils, then charge may ionize surrounding air creating corona, but this leads to increased radio interference and communication difficulties
Solution Approach 1:
The conductive coating acts as an intermediary that intercepts and conducts away electrostatic charge before it can accumulate to levels sufficient to ionize the surrounding air and create corona discharge. This prevents the harmful radio interference and communication disruptions that would result from corona effects.
4Reliability
If conductive coating is applied to airfoil surface, then electrostatic charge dissipation is improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process incorporates a conductive coating step that changes the electrical conductivity parameter of the airfoil surface. While this adds a manufacturing step, the coating can be applied using established techniques such as electrostatic spraying, dip coating, or vapor deposition, which integrate reasonably well into existing airfoil manufacturing workflows.
Solution Approach 2:
The airfoil is transformed from a single-material structure to a composite structure with a conductive coating layer on the substrate. This composite approach enables the airfoil to simultaneously maintain its aerodynamic function and gain electrostatic charge dissipation capability through the conductive coating layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively dissipates electrostatic charge, reducing the risk of sparks, radio interference, and material damage, ensuring safe operation and minimizing risks to personnel and equipment.
Implementation Method 1
electrostatic charge builds up on the airfoils of the gas turbine engine
Implementation Method 2
the friction of the impurity particles against the airfoils causes this buildup of electrostatic charge
Implementation Method 3
A fan blade, comprising: an electrostatic dissipative coating, a conductive sheath, and a conductive ground tab with a flow path that directs electrostatic charge safely to the rotor
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A fan blade (60) capable of dissipating a buildup of electrostatic charge configured for operation within the fan assembly (20) of a gas turbine engine (10). The fan blade has a fan blade body (65) covered in a static dissipative coating (63). A conductive ground tab (73) is attached to the front face (77) of an airfoil root (70) of the fan blade. Connected to the ground tab, a conductive flow path (100) travels up the neck portion (71) of the airfoil and along a lower portion of the fan blade. As static charge builds up on the fan blade, the electrostatic charge migrates down the fan blade and into the conductive flow path. Traveling along the conductive flow path the buildup of electrostatic charge accumulates on the conductive ground tab and exits the fan blade through contact with a disc rotor covering (55) touching the conductive ground tab.